Mask



FIG. 1 is a front, left side perspective view of a mask showing our new design, shown folded;

FIG. 2 is a right side, rear perspective view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a rear, left-side perspective view thereof shown partially unfolded;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a back elevational view thereof; and,

FIG. 7 is a rear, left-side perspective view thereof shown partially unfolded.

The broken lines are included for the purpose of illustrating portions of the mask that form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 